Pin for securing artificial teeth and process of making the same.



K. FINCKH. PIN FOR SECURING ARTIFICIAL TEETH ANI) PROCESS 0F MAKING THE SAME.

APPLICATION FILED FEB.'24, 1913.

Patented' June 22, 1915.

WN 5. ,A W U. UI. R mmf THE MORRIS PETERS cn., PH010L/THO., WASHINGTQN. D, C'.

KARL FINCKI-I, OF BERLIN, GERMANY, ASSIGNOR TO BERLINER IMPORT- UND EXPORT- GESELLSCHAFT, M. B. I-I., 0F BERLIN, GERMANY. A CORPORATION OF GERMANY.

PIN FOR SECURING ARTIFICIAL TEETI-I AND PROCESS OF MAKING THE SAME.

rilassa Application filed February 24, 1913.

T0 all whom t may concern.'

Be it known that I, KARL FINCKH, a citizen of the German Empire, and a resident of Berlin, Germany, have invented a new, useful, and Improved Pin for Securing Artificial Teeth and Process of Making the Same, of which the following is a speciiication.

My invention relates to pins by means of which artificial teeth are secured to their supports and the object of my invention is the production of pins of such kind, which shall consist of an inner core wholly incased by an outer jacket or casing.

More especially, my invention contemplates the production of pins having a core of base metal embraced on all sides by a shell of noble metal.

Pins for securing artificial teeth have heretofore been made by melting olf a length of wire composed of base metal provided with a sheath of noble metal, corresponding to the length of pin desired. In this way an alloy of the base and the noble metal was formed at the ends of the pin and these ends became oxidized during the subsequent heat treatment of teeth provided with such pins. This disadvantage is overcome by my invention which contemplates such operations upon the wire as will result in the entire incasement of the base metal core by an envelop of the noble metal, no alloy being formed and no portion of the base metal being exposed. Thus a pin is produced no part of which is oxidized or will become oxidized during the subsequent treatment to which the pin may be subjected.

The process of producing the pin of my invention is clearly set forth in the following description in which reference is made to the accompanying drawings and to the characters of reference thereon, in which drawings- Figure 1 is a longitudinal section of a partly formed pin showing the projecting ends of the casing; Fig. 2 is a section similar to that of Fig. 1, showing the projecting ends of the casino bent toward the axis of the pin; and Fig. 3 is a longitudinal section of the completely formed pin.

In carrying out my process a wire composed of a base metal core l and a noble metal casing 2 is cut off at a length exceeding the desired length of the finished pin to a degree depending upon the depth to which it is desired to remove the base metal. The

Specication of Letters Patent.

Patented J une 22, MM5.

serial No. 750,372.

base metal is now mordanted or removed from the ends of the wire to a suitable depth by chemical means, as by placing the wire or successively each end thereof in a bath which acts upon the base metal but not upon the noble metal, for example a nitric acid bath. There are thus formed ends or portions 3 of the casing which project beyond the ends of the core. The article haf an appearance more or less like that indicated by Fig. 1 of the drawings. The projecting ends 3 are now formed into a closure. This may be done by pressing the projecting ends together inwardly, toward the axis of the pin, as shown in Fig. 2 of the drawings and then sealing hermetically by autogenous welding or ov soldering with the aid of a noble metal. The sealing may, of course, be accomplished in any other suitable way with or without the preliminary operation of bending the projecting ends inwardly, When sealed. the ends in case they are not in contact with the core may be brought into such contact by pressing them axially of the pin or by treating them in any other suitable manner. In most cases the projecting ends of the casing need not be soldered or welded but simply firmly pressed against the ends of the core. The finished article will have a structure the same or substantially the same, as that shown by Fig. 3 of the drawings and will in any case comprise a core wholly enveloped or surrounded by a casing. It is obvious that, the casing being non-oxidizable, the pin may now be employed in the usual way as a means for fastening artificial teeth to their supports and may be subjected to the usual, necessary operations or treatments without becoming oxidized or deteriorating to any extent.

I claim:

1. The process of producing a securing pin for artificial teeth, which consists in removing by chemical means a suitable portion of the core from the ends of a wire composed of a core of oxidizable material and a casing of non-oxidizable material and having the required length, whereby the ends of the casing are caused to project beyond the ends of the core, and forming said projecting ends into a closure.

2. The process of producing a securing pin for artificial teeth which consists in removing by chemical means a suitable portion of the core from the ends of a wire composed ing and intimately adhering to seid core and of greater length than said core, the

ends of said casing being` closed over the ends of said core, whereby the core is wholly enveloped by said casing.

In testimony whereof I have hereunto set my hand in the presence of two subscribing 20 witnesses.

l KARL FINCKH. Witnesses 1 VVOLDEMAR HAUPT, HENRY HAsPnn.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

